If so, that's your problem, and I'm afraid you won't get much real support here. Skyrim is a Steamworks game. As such it should always be in your Steam library, whether you purchased it direct from Steam, a retailer like Amazon, or picked up a physical copy at a store.

That a) your copy of Skyrim wasn't in your Steam library to begin with, and b) Steam thought you didn't own Skyrim when you went to buy Hearthfire, and c) you couldn't get the game to update suggests to me that the copy of Skyrim that came with your PC was pirated. Otherwise, it would have been hooked into Steam from the start.

(It's also worth noting that I've never heard of a major AAA title like Skyrim coming pre-installed on a PC. I know graphics cards manufacturers will sometimes give away copies of a game with their GPUs--AMDs and Dirt 3, and IIRC Nvidia with Batman: Arkham Asylum--but never with a PC.)

If I'm misinterpreting your post and this isn't the case, then I apologize, and either way I'm pointing the finger of blame at whoever you purchased your PC from rather than you. Still, if this is true then you will need to purchase a legal copy of Skyrim (from anywhere; doesn't necessarily have to be Steam) to get it working properly and/or to purchase DLC.

If so, that's your problem, and I'm afraid you won't get much real support here. Skyrim is a Steamworks game. As such it should always be in your Steam library, whether you purchased it direct from Steam, a retailer like Amazon, or picked up a physical copy at a store.

That a) your copy of Skyrim wasn't in your Steam library to begin with, and b) Steam thought you didn't own Skyrim when you went to buy Hearthfire, and c) you couldn't get the game to update suggests to me that the copy of Skyrim that came with your PC was pirated. Otherwise, it would have been hooked into Steam from the start.

(It's also worth noting that I've never heard of a major AAA title like Skyrim coming pre-installed on a PC. I know graphics cards manufacturers will sometimes give away copies of a game with their GPUs--AMDs and Dirt 3, and IIRC Nvidia with Batman: Arkham Asylum--but never with a PC.)

If I'm misinterpreting your post and this isn't the case, then I apologize, and either way I'm pointing the finger of blame at whoever you purchased your PC from rather than you. Still, if this is true then you will need to purchase a legal copy of Skyrim (from anywhere; doesn't necessarily have to be Steam) to get it working properly and/or to purchase DLC.

This

They likely would have provided a Steam key if it was a legit offer. Did you buy from well known source?

If so, that's your problem, and I'm afraid you won't get much real support here. Skyrim is a Steamworks game. As such it should always be in your Steam library, whether you purchased it direct from Steam, a retailer like Amazon, or picked up a physical copy at a store.

That a) your copy of Skyrim wasn't in your Steam library to begin with, and b) Steam thought you didn't own Skyrim when you went to buy Hearthfire, and c) you couldn't get the game to update suggests to me that the copy of Skyrim that came with your PC was pirated. Otherwise, it would have been hooked into Steam from the start.

(It's also worth noting that I've never heard of a major AAA title like Skyrim coming pre-installed on a PC. I know graphics cards manufacturers will sometimes give away copies of a game with their GPUs--AMDs and Dirt 3, and IIRC Nvidia with Batman: Arkham Asylum--but never with a PC.)

If I'm misinterpreting your post and this isn't the case, then I apologize, and either way I'm pointing the finger of blame at whoever you purchased your PC from rather than you. Still, if this is true then you will need to purchase a legal copy of Skyrim (from anywhere; doesn't necessarily have to be Steam) to get it working properly and/or to purchase DLC.

A few people mentioned that I could simply get a Pirated update, but I'm not for that.

The PC was in use before I bought it, So my guess is the College student I bought it off must have Pirated it at some point, Because the PC didn't even have Steam installed into it. I'm really not entirely sure, all I know is that it when I bought it, Skyrim was already installed into it, And I'm guessing for that reason, steam can not recognize it.

It's the only game I've tried playing with Steam that was not installed THROUGH Steam, So I'm guessing there's the flaw.

The only reason I'd really have any problem is because this would be the third Skyrim game I've bought. One of my PS3, my Xbox 360, and now I may have to buy it for PC.

As it is, I'm not really very fond of having a Pirated game in my computer. And now that I think about it, I probably have THREE pirated games in my computer, So I should probably delete them.

Most certainly not. The Steam Winter Sale will save you when it comes to buying Skyrim. Be careful of what computers you buy in the future. The other games on the computer are probably pirates too, check them.

Uh, so you basically purchased a computer and used the same Steam account that the other fellow created? Seems kinda fishy to me, the entire thing, seeing as how you have changed the time frames of when you bought the computer (if you bought it a "Few years ago" and Skyrim was on it, that's not plausible, it came out in 2011)

If you are telling the truth about buying the machine second hand, you should have reformatted it before doing anything. Sharing a Steam account I believe is against the rules.